Polymethine dyes and process for preparing the same



i aiei'iied Nov. 1274i nrsssisnraocnssron ARINGTHESAMli' Frank L. Whiteand Grafton lLKeyes, Rochester, 1 17., aslignorstoEastman Boehester, N. 'Y., a corporati .Kodak Company; not New Jersey Nolh'awing. Original ImflicltionAprii- 23, 1937,

I Serla'l No. 138,834.

Divided and this applicamam September a, 1938, Serial No. 228,448

14 Claim.

This inventionrelatesto pclyniethine dyes and to a process forpreparing the some.

.Certain dyes-are known to alter the sensitivity of photographic silver halide emulsions. For example, certain dyes oi thecyanine class have been found to alter the sensitivity of photographic emulsions. Dyes of the merocyanine class (see United 'States Patent No. 2,078,233, dated April 27, 1937,) have been found to sensitize photographic emulsions. However, not all dyes alter the sensitivity of photographic emulsions. In order for a dye to sensitize a photographic silver halide emulsion, it must not only be adsorbed by the silver halide, but must be so adsorbed thata proper exchange of energy between the dye and the silverhaiide obtains. It

is, oi. course, impossible to fiorecast whether or not a will be adsorbed'on a silver halide and whethercr nota dye will adsorbed in a manner which permits the proper exchange of energy between the" dye and silver' halide.

We have now found anentirely new class of dyes andhave "further Ioundthat these ,dyes sensitize photographic emulsionsfin a new anduseiul- 'manner. our copending application Serial No. l38,634,fl1ed April {23,1937, (now United StatesPatent "2,166, '136-, dated July. 18, 1939) of which tl'i in'stant application is a dii i j -11 ts object; therefore, of our present invention is to provide new fdyes; "A further object is to provide new-photographic sensitizing dyes. A

still rurther'object is to provide a process for preparing "sued-ne dyes.- Other bjects will app ar-hereinafter! e s u nv n. 049w illustrated by thei'ollowinggeneral formulas p I,

groups, L represents a methylene "group, a repre sents a-1 1 positive integer not? greater than three,

wherein :Dwrepresents ivinylen or phenylene J represents hydrogen #or" an aliphatic group whileQ represents 'an supp-sue group and J and Q'toge'ther represent the nch-metallic atoms necessary-to" "complete a basic cyclic organic nucleus pyr rol nucleus; It represents an other; tha

J is known, e v

Such dyes as that formulated immediately above are inner quaternary salts. The valence bond designated as (V) is attached to some position in the formulated molecule. As. clearly shown in Formulas Ia' and 1b above, such inner quatemarysalts are not contemplated in our invention, Furthermore, such inner quaternary salts cannot be made by the process we employ in preparing our new dyes, and such inner quaternary salts have properties distinct from those of our new dyes. 1 I

More particularly in Formulas Ia and 1b, J and Q can each represent an alkyl group, such-as methyl, ethyl, n-butyl, allyl; benzyl, p-hydroxyethyl, turylmethyl (iurfuryl) or the like and J and Q together can represent the non-metallic atoms necessary to complete an organic cyclic basic nucleus, such as piperidine, a tetrahydroquinoline, a N-alkylpiperazine, a piperazine, a morpholine or like nucleus. Z can represent the non-metallic atoms necess ry to complete a iive membered heterocyclic nucleus, such as a thi-' azole nucleus. for example benzothiazole, 4- chloro-benzothiazole, 5 -methylbenzothia'zole, 4-

methylthiazole, naphthothiaz oles, i phenylthiazole, 4,5-diphenylthiazole or the like, an oxazole I nucleus, for example benzoxamle, iaphthoxazoles, *i-methyloxazole, 4-phenyloxazole or the like, a 'selenazol nucleus, for example b'enzoselehazoleLf-a selenazole, 4-methylselenazole or 4-phenyls elenazole; a 3,3 -dialkylindolenine nualkylsulfate, perchlorate, nitrate, p-toluenesulfonate or the like. R can represent alkyl groups such as methyl, ethyl, n-butyl, benzyl, allyl or the like.

Our new dyes can be prepared by reacting a basic primary or secondary non-aromatic amine,

particularly a monoamine, with a compound of w wherein D represents a vlnylene. orphenylene group, n represents a positive integer not, greater than three, R represents an acyl group, R" represents an aryl group, R, XandZ, have the values indicated above under Formulas Ia and lb. More particularly, in Formulas Ho and 1117, R can represent an acyl group, such as acetyl, propionyl, butyryl, benzoyl or the like and R" can represent an aryl group, such as phenyl, napththyl, xylyl, diphenyl or the like, i. e., an aryl group containing not more than twelve nuclear carbon atoms, for example.

The basic non-aromatic primaryv or secondary amines are advantageously reacted with the compounds or Formula In: or 11b in the presence of a diluent, such as a lower aliphatic alcohol, i. e., one of tour carbon atoms or less. However, the diluent is not essential. Other diluents, such as ethylidene dichloride, ethylene dichloride or dioxane, can be used. The diluent should be inert toward the dyes and so chosen that the formed dye will separate therefrom at least upon cooling. Heat accelerates the formation of our new dyes. The non-aromatic primary or secondaryamine is advantageously employed in molecular excess; from 1.5 to 3 molecular proportions (mol.) per molecular proportion of compound of Formulas Hi: and 11b is suitable. Witha molecular ratio] of 1:1 the yield of our new dyes is generally low-' er than when an excess is employed.

Compounds of Formulas Ila and Ill; can be, 55 prepared by reacting a cyclammonium quaternary salt containing a reactive alkyl group in the alpha or gamma position, i. e., one of the so-called reactive positions, with a compound of the following formula:

wherein L represents a methenyl group, n represents a positive odd integer not greater than five,

p-anilinoacrolein anil, p-anilino-a-bromacrolein anil, fl-anilino-a-chloroacrolein anil and their hydrochlorides, glutaconic aldehyde dianilide hyhydrochloride, a- (p-naphthylimino-e- (p-naphthylamino)-a'-methyl-a, y pen'tadiene hydrochloride (see Kiinig, Journal fiir "praktisch'e Chemie, vol. 69, page 136), etc. The compounds '01 Formula III can be reacted with cyclammonium quaternary salts containing a reactive alkylgroup by mere heating or the reactants togethenadvantageously in the presence of acetic anhydride or the like. The cyclammonium quaternary salts which can be employed are those corresponding to the heterocyclic nuclei pointed out above under Formulas Ia and Ib, i. e. for example, quaternary salts or l-methylbenzo- ,,thiazole, l-ethylbenzothiazole, a-methylnaphdi-sec-but'ylamina, di-isopropylamine. di-n-de-v thothiazoles, quinaldine, aand -picolines, lepidine, I-methylbenzoxazole, -methylnaphthoxazoles, .;-l-methylbenzoselenazole; 2,4-dimethylthlazole, 2-methyl-4 -phenylthiazole, 2,3,3-

trimethylindolenine, 2 -meth'ylthiazoline andthe like.

The basic primary or secondary non-aromatic amines which can be reacted with compounds of Formulas. I10: and 11b, are, for example, aliphatic amines, for instance'monoalkylamines, such .as methylamine, ethylamine, n-butylamine secbutylamine, isopropylamine, n-decylamines, cyclohex'ylamine,v furfurylamine, tetrahydroturiurylamine, ,e-hydroxyethyl amine, allylamine, benzylamine' or the. like or dialkylamines, such asdim'ethylamine, diethylamine, di-n-butylamine,

cylamines, difuriurylamine, di-p-hydroxyethylamine, dibenzylamine or the like, or secondary basic heterocyclic amines, such as iiv'e-membered basic heterocyclic amines, for example, PYII'Oli-e dines or the like or six-membered basic hetero,-

cyclic amines, for example, piperidine, morpho-.

line, 1,2,3,4-tetrahydroquinolines, piperazine, N-alkyl-piperazines or thelike. Pyrrol cannot be used in our process.

Reactionproducts of compounds of Formula III withsuch cyclammoniumquaternary salts: prepared in the presence oi acetic anhydride or the like are the acylated compounds of Formulas Ho and 11b. When prepared in the absence of acetic anhydride or the like, the reaction products must be acylated by treatment with acylating agents, such as acid anhydridesor acid chlorides, e. g. acetic, propionic, or benzoic anhydrides. We have found the acetylated comspounds are particularly useful in preparing our new-dyes.

The following procedures will serve to illustrate the manner of obtaining compounds 01 Formulas Ila and Ill).

2-(fi-acetanilidovinyl)-qulno1ine ethiodide can be prepared by heating, at about C. for about 10 minutes with stirring, 60 g. (1 mol.) of quinaldine ethiodide and 40 g. (1 mol.) of diphenyl Iormamidine. The cooled reaction mixture is advantageously ground with acetone, and then filtered and dried. 20 g. (1 mol.) of this acetonetreated reaction product was refluxed in about 50 cc. 0! acetic anhydride, for about 10 minutes.

The reaction mixture wastchilled and the 2-(pamidine in about 220 cc. oi glacial acetic acid.

The reaction product separated m the cooled :reaction mixture. It was refluxed, tor about15 minutes insuflicientjacetic anhydride to form a solution. One molecular-proportion of pyridine washed with acetone and dried.

l- (p acetanilidovinyl) benzoxazole ethiodide can be prepared by refluxing, for about 20 minutes, 40 g. (1 mol.) of diphenyiformamidine and 58 g. (1 mol.) of l-methylbenzoxazole ethiodide in about 250 cc. of acetic anhydride. The l-(pacetanilidovinyl) -benzoxazole ethiodide separated irom the chilled reaction mixture and was washed with acetone and dried.

4-(p-acetanilidovinyl) -quino1ine ethiodide can be prepared by heating, at 150 C. to 160 C. with stirring, an intimate mixture of 29.9 g. (1 mol.) of lepidine ethiodide and 19.6 g. (1 mol.) of diphenyliormamidine for about minutes. The cooled reaction mass was stirred with acetone and the acetone-treated reaction product then refluxed in sufllcient acetic anhydride to form a solution, for about minutes. One molecular proportion of pyridine for each molecular proportion of reaction product is advantageously employed in the solution during refluxing. The 4-(B-acetanilidovinyl) -quinoline" ethiodide was precipitated from solution by adding diethyl ether. The precipitated acetone and dried.

*1-(4 acetanilido A -butadienyl) -benzothiazole acetic anhydride. The 1-(4 acetani1ido) compound separated from the chilled reaction mixture. It was filtered, washed with acetone and dried.

product was stirred with V 2- (4- acetanilido A butadienyl) quinoline ethiodide can-be prepared by refluxing, for about one hour, 3 g: (1 mol.) of quinaldine ethiodide and 2.15 8-.(1,mql,-) =o. peanilinoacrolein anil hydrochloride inaabout cc; of. acetic anhydride.

Thereaction mixture-was chilled and the acet anilido eompound,..iprec ipitatedi by adding two volumes;-(about 40=.cc.)- ofxdie i yl ether. The. acetanilido compound was; washed withwater andacetenenw- -w .1-(4 .1acetanilido-n butadienyli benzoxazoleethiodide can be prepared byrefluxing, for about one hour, 2,9 g. ethiodide and'2.5 1 mol.);o f ja-anili noacrolein anil hydrochloride 'in"about20"cc.of acetic anhydride. The reaction mixture was chilled and the acetanilidocompound precipitated with two volumes (about 40 cc.)'- 'of diethyl ether. The tarry precipitate was stirred with acetone until crystalline. v

l-(fi-acetanilido A hexatrienyl) -benzoxazole ethiodide canbe prepared by refluxing, for

, inoi.) of 1-qnethylbenaoxazole.

glutaconic aldehyde dianilide hydrochloride. in

about 4,0 ,cc.,oi acetic anhydridei." The acetanilido compound separated from thechilled reaction mixture. It was washed withaceione.

Still further illustrations of the preparation of these dye-intermediates will be found in the following examples. 1

Compounds of Formula 111 where n represents one can be prepared as described by Claisen in Annalen, vol. 287, page 366 (1895) and by Comstock 8: Wheeler in the American Chemical Journal, vol. 13, page 516 (1891) and by Dains in the Berichte der deutschen chemischen Gesellschait, vol. 35, 2498-2501 (1902). Compounds of Formula III where n represents three can be prepared as described by Reitzenstein & Bdnitsch in the journal flir praktische chemie, vol. 86, page 1 (1912) and by Dieckmann & Platz in the Berichte der deutschen chemischen Gesellschaft, vol. 37, pages 4635-4638 (1904). Compounds of Formula 111 wherein n represents five can be prepared as described by Zincke in Annalen, vol. 330, page 361 1) and by Zincke, Heuser 8i Miiiler in Annalen, vol. 333, page 296 (1904) and by Zincke 8: Wiirker in Annalen, vol. 338, page 107 (1905) and by Kdnig in journal fiir praktische chemie, (2) vol. 69, page 129 and (2) vol. '70, pages 23 and 52.

By the term non-aromatic amine, we mean an amine in which the amino group is not directly attached to a benzene or equivalent aromatic ring system as the amino group is in aniline, methylaniline, aand p-naphthylamines, 1 aminoanthraquinone, a aminopyridine, 5-

aminoquinoline or the like.

,to limit our invention.

Non-one 2.2 (111101.) of l-(p-acetanilidovinyD- benzoxazole ethiodide, 1.2 g. (3 mol.) of morpholine and 15 cc. of absolute ethyl-alcohol were refluxed for about thirty minutes. The dye separated from the cooled reaction mixture and after twice recrystallizing trom ethyl alcohol was obtained as pale yellow crystals melting at 211- 213" C. Its ethyl alcoholic solution is colorless.

v Eamon: 2.-1 [p-(I-piperidubvinyl] -benzothiazole ethiodide 1.1 g. (1 mol.) of 1- (p-acetanilidovinyD-benzothiazole ethiodide, 0.8 g. (3 mol.) of piperidine and cc. of absolute ethyl alcohol wererefluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after twice recrystallizing from methyl alcohol was obtained as light yellow crystals melting at 274-277 C. with decompofition. Its methyl alcoholic solution -was pale yellow.

Exmu: 3.--1-[fi-(4 morpholul vinyZl-benzothiazole ethiodide 2.5 g. (1 mol.) of 2-(p-acetanilidovinyD-pnaphthothiazole ethiodide, 1.2 g. (3 mol.) oi piperidine and 25 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after twice recrystallizing i'rom methyl alcohol was obtained as brownish yellow crystals melting at 230-232 C. with decomposition. Its methyl alcoholic solution was pale yellow.

2 (a acetanilidovinyl) p naphthothiazole ethiodide can be made by refluxing 3.5 g. (1 mol.) oi 2-methyl-p-naphthothiazole ethiodide, 1.9 g. (1 mol.) of diphenyllormamidine and 7 cc. of acetic anhydride for about 20 minutes. The reaction mixture was chilled. and the solid product which separated was filtered, washed with water and acetone and dried. Upon recrystallization from acetic acid, it melted at 180' C. with decomposition.

Exlmru 5.--2-[p-(1-pipcridyl) minyll quinoline ethiodide aaeane quinoline ethiodide, 0.6 g. (3 mol.) oi piperidine and 20 cc. oi absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after twice recrystallizing 1'rom methyl alcohol was obtained as yellow crystals melting at 253-255 C. with decomposition. Its methyl alcoholic solution was yellow.

In the above five examples, the piperidine and morpholine can be replaced with any basic nonaromatic primary or secondary amine such as pointed out above in connection with reaction with compounds of Formulas Ha and 11b. Likewise, the 1 (p acetanilidovinyl) benzoxazole ethiodide, 1- a-acetanilidovinyl) benzothiazole ethiodide, 2 (p acetanilidovinyl) p-naphthothiazole ethiodide and 2- (pl-acetanilidovinyl)- quinoline ethiodide can be replaced by other quaternary salts, such as butiodides, alkyl sulfates, alkyl-p-toluenesulfonate or the like, as well as by acetanilidovinyl derivatives of cyclammonium alkyl quaternary salts of bases corresponding to the nuclei pointed out above under Formulas Ia and II).

The following examples serve to illustrate the mode of preparation of our new dyes of Formulas 11a and 11b where n equals two. These examples are not intended to limit our invention.

EXAMPLE 6.--1 -[4-(1-piperidyl) -A -lrutadienyll benzothiazole ethiodide Exaurrs '7.1-[4 (4-morphol1 l) -A butadienyll -benzothiazole ethiodide H: H: S

o-c o NCH=CH-CH=CHC 3' w l I A 1.2 g. (1 mol.) of 1-(4-acetanilido-A -3-butadienyD-benzothiazole ethiodide, 0.7 g. (3 mol.) of morpholine and 20 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after twice recrystallizing from methyl alcohol was obtained as minute reddish crystals melting at 248-251" C. with decomposition. Its methyl alcoholic solution was deep yellow.

EXAMPLE 8.--1 -(4-di-p-hydroryethylamino-A butadiem l) -benzothiazole ethiodide 1.2 g. (1 mol.) 0! 1-(4-acetanilido-A -butaof diethaholamlhe and 20 cc. of absolute-ethyl alcohol were refluxed for about 30 minutes. The dye separated .irom the cooled reaction mixture. and after tworecrystallizations from methyl alcohol was obtained as bluish crystals melting at 210.to.2l2'* C. with decomposition. Its methyl alcoholic solution wasyellow.

Exams: i l."---1-(4-111-nundermine-i -butadienyl) -bcnzothiuzole ethiodtde s CIHI Can: 7

31.2 g; (1 mol.) of 1-(4-acetanilido-A -butadlenyll-benzothiazole' ethiodide, 0.9 g. of (ii-nbutylamine and 10cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after two recrystallizations from ethyl acetate was obtained as reddish crystals with a blue reflex and melting at 150 to 152 C. with decomposition. Its ethyl acetate solution was golden yellow.

EXAMPLE 10.--1 (4 diethylamino-n butadienyl) -benzothiazole ethiodide 1.2 g. (1 mol.) of 1-(4-acetani1ido-A -butadienyl) -benzothiazole ethiodide, 0.6 g. (3 mol.) of diethylamine and cc.- of absolute ethyl alcohol were refluxed for 30 minutes. The dye separated from'the cooled reaction mixture and was twice recrystallized from acetone. The dye was obtained as minutereddish needles melting at 209 to 211 C. with decomposition. The dye gavea deep yellow solution in acetone.

Exams-e 11.1-(4-dibenzylamino-A -butadieng l) -benzothiazole ethiodide 1.2 g. (111101.) of 1-(4-acetanilido-A '=-butadienyllebenzothia zole ethiodide, 0.75 g. (3 mol.) of diallylamine and 15 cc. of absolute ethyl alcoa203,? 1 ti'iiaibi -etmomaeg 0.8 re mol.)

m w t n e e: ee-23p dye screw d tra he cooled; reaction and alter successive" recrystallizations from methyl alcohol and then *ethyl acetate was Dbtainedas dull reddish crystals melting at 164 to 166 C. with decomposition. Its ethyl acetate solution'was a deep yellow.

1-(4-acetanilido-N-Lbutadienyl) benzoxazole ethiodlde can be prepared byrefluxing 2.9 g. (1 mol.) of l-methyibenzoxazole ethiodide. 2.5 g. (1 mol.) '0! B-anilinoacrolein' anil hydrochloride and 30 cc. of acetic anhydride for about minutes. The reaction mixture waschilled and 50 cc. of diethyl ether added. The ether-mixture was allowed to stand 12 hours in an ice-box when a tarry precipitate formed. The ether was decanted and the residue stirred with acetone 00.). The tarry massdissolved and upon standing crystals separated. These crystals were illtered oil, washed with acetone and dried;

mm 13.--1- [4 1 piperidyl) a -bummenyll -benzo:razole ,ethiodide 1.1 g. (1 mol.) of 1-(4-acetanilido-A -butadienyl) -benzoxazole ethiodide, 0.6 g. (3 mol.) of piperidine and 15 cc. of absolute ethyl alcohol were refluxed for about 30-minutes. The dye separated from the cooled reaction mixture and after two recrystallizations from ethyl alcohol was obtained as minute yellow crystals melting at 192" to "195 C. with decomposition. Its solution in ethyl alcohol was yellow.

ExmPLs 14.-.--1-[4-( methozy 1 tetrahydroquinolyl) -A -butadienull -ben. 2othiazole ethiodide 1.2 g. (1 mol.) of l-(4-acetanilido-Al- -butadienyD-benzothiazole ethiodide, 0.4 g. (1 mol.) of l.2,3,4-tetrahydro-6-methoxy quinoline and 20 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after two recrystallizations from methyl alcohol was obtained as minute greenish crystals melting at 252 to'254" C. with decomposition. Its methyl alcoholic 'solution was bluish-red.

EXAMPLE 15.--1- (4-n-butylamino-A -buta dienyl) -benzoth iazole ethiodide 2.4 g. (1 mol.) of 1-(4-acetanilido-A -Lbutadienyl) -benzothiazole ethiodide, 1.0 g. (3 mol.) of n-butylamine and 10 cc. 01'v absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated irom the cooled reaction mixture. and after two recrystallizations from methyl alcohol was obtained as minute brownish crystals melting at 174.5 to 176.5 C. with decomposition. Its methyl alcohol solution was brownish yellow.

ExAnrL: 16. 1 -(4-di-tetrahydrofurfurylamino- A -butadi'enyl) -benzothiazole ethoperchloratc /CHCH:

CHz- H: 2.4 g. (1 mol.) of 1-(4-acetanilido-A -butadienyl) -benzothiazole ethiodide, 2.7 g. (3 mol.) of ditetrahydrofurfuryl-amine and cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye was precipitated by chilling the reaction mixture and adding thereto cc. of

EXAMPLE 1'7.2-(4-diethylamin0-A -butadienyl) -,B-naphthothiazole ethiodide 1.3 g. (1 mol.) of 2-(Lacetanilido-A- -butadienyl) -fl-naphthothiazole ethiodide, 0.6 g. (3 mol.) of diethylamine and 10cc. of absolute ethyl alcohol were refluxed for about minutes. The dye separated from the cooled reaction mixture and was recrystallized from 95% ethyl alcohol and obtained as dark greenish crystals melting at 205 to 208 C. with decomposition. Its ethyl alcoholic solution was pinkish-orange.

2- (4-acetanilido-A -butadienyl) 13 naphtho thiazole ethiodide was prepared by refluxing 3.5 g. (1 mol.) of 2-methyl-fl-napthothiazole ethiodide, 2.5 g. (1 mol.). of p-anilihoacrolein anil hydrochloride and 20 cc. of acetic anhydride for about minutes. The reaction mixture was chilled and the product precipitated by adding ether (60 cc.). The product was stirred with acetone, filtered, washed with acetone and dried.

Exlmrm 18. 2-(4-ditetrahydrofurfurylamino- A -butadienyl) -fl-naphthothiazole ethiodide 1.3 g. (1 mol.) of 2-(4-acetanilido-A- -butadienyl)-fl-napthothiazole ethiodide, 1.35 g. (3 mol.) of ditetrahydrofurfurylamine and 10 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after two recrystallizations from methyl alcohol was obtained as dark reddish-purple crystals meltlngat 133.5 to 135.5 C. Its methyl alcoholic solution was pinkish.

EXAMPLE l9.-2 [4 1-piperidyll:-A'- butadienyl -fl-naphthothiazole ethiodide N CI Ih I l 1.3 g. (1 mol.) of 2-(4-acetaniIido-A -butadienyl) -B-naphthothiazo1e ethiodide, 0.6 g. (3 mol.) of piperdine and 10 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated'from the cooled reaction mixture and after two reczystallizations from methyl alcohol was obtained as reddish crystals melting at 148 to 151 C. with decomposition. Its methyl alcoholic solution was purplish-orange,

EXAMPLE 20-1-(4-dieth1 Zamin0-A -butadienyl) -benzoselenazole ethiodide 2.6 g. (1 mol.) ofl-(4-acetanilido-A -butadienyl)-benzoselenazole ethiodide, 0.6 g. (3 mol). of diethylamine and 15 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after two recrystallizations from acetone and one tone.

EXAMPLE 21.-2- [4-(1 piperidyl) A butadienyll-quinoline ethiodide 1.1 g. (1 mol.) of 2-(4-acetanilido-A -butadienyl)-quinoline ethiodide, 0.6 g. (3 mol.) of piperidine and 15cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and, after two recrystallizations from ethyl alcohol, was obtained as minute reddish crystals melting at 237 to 239 C. with decomposition. Its ethyl alcoholic solution was pinkish-orange.

EXAMPLE 22.4- [4- (1 miperidyl) -A' -butadienyll-quinoline ethiodz'de 2.20. (1 mol.) of 4-(4-acetanilido-A -butadienyl) -quinoline ethiodide, 1.2 g. (3 mol.) of piperidine and cc. of absoluteethyl alcohol were refluxed for about 30 minutes. The 'dye sepa- EXAMPLE 23. 1,4-di- [4- (1 -benzothiazul) -A butadienul] piperazine diethiodide 1.2 g. (2 mol.) of 1-(4-acetanilido-A -butadienyl) -benzothiazole ethiodide, 0.25 g. (2 mol.) of piperazine hexahydrate and cc. of absolute ethyl alcohol were refluxed for about minutes. The dye separated from the cooled reaction mixture and after recrystallization from methyl alcohol was obtained as minute reddish crystals melting at 303 to 305 C. with decomposition. Its methyl alcoholic solution was pinkishorange.

EXAMPLE 24.-1,4-di- [4- (1 -benzoxazyl-A -buta dienyl miperazine diethiodide 2.3 g. (2 mol.) of 1-(4-acetanilido-A -butadienyl) benzoxazole ethiodide, 0.5 g. (2 mol.) of piperazine hexahydrate and 30 cc. of absolute ethyl alcohol were refluxed for about 30 minutes. The dye separated from the cooled reaction mixture and after recrystallization twice from methyl alcohol was obtained as brownish-orange crystals melting at 298 to 300 C. with decomposition Its methyl alcoholic solution was deep yellow.

dienqll-piperazinc dietlu'odide i 2.2; g. (2 5 mol.) of "2 -(4-acetanilido Al buta-* .dienyl) -quinoline ethiodide, 0.5 8.:(2 mol.)"of .piperazine hydrate and 20 cc. olf absolute ethyl al- (001101;. were refluxed for about 30 minutes." A The ,dye:separated from the cocledreaction mixture andxwas twice-recrystallized frommethyl' alcohol 75 and obtained as brownish-purple crystals melting at 287 to 289 C. with decomposition. Its methyl alcoholic solution was deep crimson.

In the above twenty examples, the piperidine, morpholine, butylamine, diethylamine, diallylamine, dibutylamine, ditetrahydrofurturylamine, dibenzylamine, piperazine and tetrahydroquinoline can be replaced with any basic non-aromatic primary or secondary amine such as pointed out above in connection with reaction with com-- pounds 01' Formulas 11a and 11b. Likewise, the acetanilido-Alf-butadienyl ethiodides can be replaced withother. quatemary salts, e. g., butiodides, propobromides, .alkylsulfates, alkyltoluenesulfonates or the like. Likewise, acylanilido- A 'F -butadienyl derivatives of 4methylthiazole, 4-phenylthiazole, 4-methylcxazole, 4-phenyloxazole, 4,5-diphenylthiazole, .4-phenylselenazole, thiazoline, selenazoline, 3,3-dialkylindolenine or the like quaternary salts can be reacted with primary or secondary basic non-aromatic amines. The following examples will serve to illustrate the mode of preparation of our new dyes of Formulas 11a and 1th where n equals three.

These examples are not intended to limit our invention.

Exmru 26.1 [6-(1-piperidyl) -A -he:m-

trienyll-benzothiazole ethiodide 1.25 g. (1 mol.) of 1-(6-acetanilido-A -hexatrienyl) -benzothiazole ethiodide, 0.6 g. (3 mol.) of piperidine and 10 cc. of absolute ethyl alcohol were mixed and allowed to stand at room temperature (20 to 25 C.) for about l5minutes. The dye separated and was filtered on and 'dissolved from the impurities by extraction with hot ethyl alcohol. It was recrystallized a second time from ethyl alcohol and obtained as dark blue crystals melting at 120.5-to 123.5" C. with decomposition. Its ethyl alcoholicsolution was purple.

' The 'i-"le adianniiio- -hext ienyiiv bn z othiazole ethioiiig'ie p epared; as ,fo'llowsz. 12.2 is. (1: mol.) of, l-methylbenzothiazmmethiodide,

11.4"; (1 'moll)g oi glutaconicaldqhydeadianilide hydrochl ride and; .59. of; a etic. anhydride were heated to refluxing for about 10 minutes.

The product was washed with water and used without further purification.

EXAMPLE 27.--1- [6- (4-morpholyl) -A -hexatrienyll -benzothiazole ethiodide 1.25 g. (1 mol.) of 1-(fi-acetanilido-A -hexatrienyD-benzothiazole ethiodide, 0.7 g. (3 mol.) of morpholine and cc. of absolute ethyl alcohol were mixed and allowed to stand at to C. for about ten minutes. The dye separated and was dissolved from the impurities by extraction with hot methyl alcohol. After a second recrystallization from methyl alcohol, the dye was obtained as dark blue crystals melting at 154.5" to 156.5 C. with decomposition. Its methyl alcoholic solution was purple.

In the above two examples, the piperidine and morpholine can be replaced by any basic nonaromatic primary or secondary amine such as pointed out above in connection with reaction with compounds of Formulas 11a and 11b. Likewise, the acetanilido-A -hexatrienyl ethiodides can be replaced with other quaternary salts, e. g.. butiodides, propobromides, alkylsulfates, alkyltoluenesulfonates or the like. Likewise, acylanilido derivatives of other quaternary salts such as pointed out above in Formulas 11a and II!) can be reacted with primary or secondary nonaromatic basic amines.

We have found it advantageous to obtain our new dyes in the form of the dye-iodides in most instances. The dye-iodides are also a satisfactory form of our new dyes to employ in preparing sensitized photographic emulsions, we have found. However, the dyeiodides can be converted into other dyesalts. For instance, in Example 16, the dyeiodide was converted into the less soluble dye perchlorate by treatment with sodium perchlorate. Our dye-iodides can be converted into dye chlorides by dissolving the dye-iodides in methyl alcohol or other suitable solvent, adding an excess of freshly prepared silver chloride to the sor lution and refluxing the mixture for several hours. The silver iodide formed is filtrated of! and the resulting solution concentrated and chilled to precipitate the dye-chloride.

In the above examples, heating under reflux is intended to mean heating the reaction mixture to moderate boiling under reflux.

Still further examples of the preparation of our new dyes could be cited, but the foregoing will be sufllcient to teach those skilled in the art the manner of obtaining our new dyes.

Our new dyes, particularly those where 1: represents one or two, can be employed in manufacturing light filters and to color cellulose acetate yarn. i. e. cellulose acetate silk.

Our new dyes can be called hemicyanine dyes. Those containing a chain of two methenyl groups (where n in Formulas Ia and lb represents one) can be called hemicarbocyanine dyes; those containing a chain of four methenyl groups (where n represents two) can be called hemidicarbocyanine dyes; and those containing a chain of six methenyl groups (where n represents three) can be called hemitricarbocyanine dyes.

Our new-hemicyanine dyes give rise to photographic emulsions possessing novel sensitivity, when incorporated therein. Our invention is particularly directed to the customarily employed gelatino-silver-halide emulsions. However, our new hemicyanine dyes can be employed in emulsions in which the carrier is other than gelatin, for example, a resinous substance or cellulosic derivative which has substantially no deleterious effect on the light-sensitive materials. As silver halide emulsions, we include such emulsions as are commonly employed in the art, for example, silver chloride or silver bromide emulsions which can contain other salts which may be light sensitive. Our hemicarbocyanine dyes (where n represents one) are advantageously employed with silver chloride emulsions. Our hemidicarbocyanine dyes are likewise advantageously employed with silver chloride emulsions (see United States Patent 2,166,736, dated July 18, 1939),

What we claim as our invention and desire to be secured by Letters Patent of the United States is:

1. As a new product, a dye of one of the following formulas:

Q X Q wherein D represents a divalent group selected from the group consisting of vinylene and phenylene groups, L represents a methenyl group, n represents a positive integer not greater than three, J represents a member selected from the group consisting of hydrogen and alkyl groups, while Q represents an alkyl group and J and Q together represent the non-metallic atoms necessary to complete a saturated organic basic mono-cyclic nucleus, R represents an alkyl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus.

2. As a new product, a dye of one of the following general formulas:

wherein D represents a divalent group selected from the group consisting of vinylene and phenylene groups, L represents a methenyl group, n represents a positive integer not greater than three, J represents a member selected from the group consisting of hydrogen and alkyl groups, while Q represents an alkyl group and J and Q together represent the non-metallic atoms necessary to complete a saturated organic basic mono-cyclic nucleus, R represents an alkyl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of flve-membered and six-membered organic heterocyclic nuclei.

3. As a new product, a dye of the following general formula:

6. As a new product, a dye of the following formula:

7. As a new product, a dye of the following formula:

H: H: 6-0 HIC N-cn=cH-ci1=cn-o c-c Ha Ha 8. A process for preparing a hemicyanine dye comprising reacting an amine selected from the group consisting of basic non-aromatic primary and secondary amines other than pyrrol with a compound of one of the following formulas:

wherein D represents. a divalent group selected from the group consisting of vinylene and phenylene groups, n represents a positive integer not greater than three, L represents a methenyl group, R represents an alkyl group, R represents an acyl group, R represents an aryl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus.

9. A process for preparing a hemicyanine dye comprising reacting a monoamine selected from the group consisting of basic non-aromatic primary and secondary monoamines other than pyrrol with-a compound of one of the following formulas:

wherein D represents a divalent group selected from the group consisting of vinylene and phenylene groups, n represents a positive integer not greater than three, R represents an alkyl group, R represents an acyl group, R" represents an aryl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of five-membered and six-membered heterocyclic nuclei.

10. A process for preparing a hemicyanine dye comprising reacting a monoamine selected from the group consisting of basic non-aromatic primary and secondary monoamines other than pyurlrol with a compound of the following form a:

wherein R represents an alkyl group, R represents an acetyl group, R" represents a phenyl group and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of flve-membered and six-membered heterocyclic nuclei.

11. A process for preparing a hemicyanine dye comprising reacting from about one and onehalf to about three molecular proportions of an amine selected from the group consisting of basic non-aromatic primary and secondary amines other than pyrrol with about one molecular proportion of a compound of one of the following formulas:

and

wherein D represents a divalent group selected from the group consisting of vinylene and phenylene groups, n represents a positive integer not greater than three, L represents a methenyl group, R represents an alkyl group, R represents an acyl group, R" represents an aryl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of five-membered and six-membered heterocyclic nuclei.

12. A process for preparing a hemicyanine dye comprising reacting from about one and onehalf to about three molecular proportions of a monoamine selected from the group consisting of non-aromatic primary and secondary monoamines other than pyrrol with a compound of the following formula:

wherein R represents an alkyl group, R. represents an acetyl group, R".represents a phenyl group and Z represents the non-metallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of flveintiembered and six-membered heterocyclic 11110 e t 13. As a new product, a dye or the Iollowing formula:

,zr n J-N-cn=cH-cn=cH-b=ri t 1: wherein J represents a monovaient group selected from the group consisting 01' hydrogen and alkyl groups while Q represents an alkyl group, and J and Q together represent the non-metallic atoms necessary to complete a saturated organic basic mono-cyclic nucleus selected from the group consisting of flve-membered and sixmembered saturated organic basic mono-cyclic nuclei, R'represents an alkyl group, X reprecents an acid radical and Z represents the nonmetallic atoms necessary to complete an organic heterocyclic nucleus selected from the group consisting of flve-mernbered and six-membered organic heterocyclic nuclei.

14. As a new product, a dye oi. the following formula:

,z R .TI;ICH=CHCH=CHC=N\ Q X wherein J and Q together represent the nonmetallic atoms necessary to complete a six-membered saturated organic mono-cyclic basic nucleus, R represents an alkyl group, X represents an acid radical and Z represents the non-metallic atoms necessary to complete an azole nucleus.

FRANK L. WHITE. GRAFTON H. KEYES. 

